Question

Choose the correct coefficients for balancing the given chemical equation. ...(NH4)2CO3 (aq) + ..AI(NO3)3 (aq) → ... NH4NO3 (
The oxidation number of Cr in Cr2O72- is... Select one: A. +3 B. -6 C.-3 D. +6
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Answer #1

3 (NH4)2CO3 + 2 Al(NO3)3 = 6 NH4NO3 + Al2(CO3)3

Answer: B)3,2,6,1

Cr2O72-

let the oxidation number of Cr be x

oxidation state of oxygen = -2

then 2x + 7*(-2) = -2

or, 2x -14 = -2

or, 2x = 14 - 2 = 12

or, x = + 6

Answer : D) +6

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